"Far future" isn't a very common phrase, and it sounds very awkward in this usage. "Distant future" is the more common one. However, most native speakers wouldn't say this:
I want to get married in the distant future.
While this is a perfectly valid sentence, it's a strange phrasing. The speaker sounds determined to be married (want is a strong word), but they don't know when; yet, they say "distant future" as if it is a definite time. Particularly, I think it is the prepositional phrase "in the..." that makes it sound more definite.
I would instead expect someone to say this:
I want to get married, but not any time soon.
The "but" offers contrast with the fact that the speaker wants to be married.
In this version, the speaker sounds a little less motivated:
I'd like to get married at some point.
You could also mix and match the halves of the two sentences ("I want to get married at some point")