Seemingly no, he carried out his Senate term and followed it with a term as Colorado Governor. Oddly the event isn't mentioned on his Wikipedia page as of now, what he's most "famous" for is his denouncement of Ingrid Bergman for adultery in 1950.

I don't think people as high as US Senators face the prospect of criminal charges for most felonies. They would only be in that position if it the criminal charge was advantageous for both political parties; say if he was charged with defrauding a charity or beating his wife.

>I wonder if senator Johnson ever faced any criminal prosecution for his actions here or if he too high profile to consider such actions against.

Beyond what others said, any prosecution would confirm to the world (and, specifically, the Soviets) that what he said was accurate.