Can an airline cancel a ticket for too low a price?

So a couple of months ago I bought a round trip ticket from the US to Hungary in November for $610 (including taxes and fees) and everything went through fine. Just out of curiousity for the past week I went on Kayak to see the lowest price ticket I could find for the dates I am going to be flying and it hasn't gone lower than $776. So now I am a bit paranoid...I am wondering if the airline made a mistake with my ticket and charged me lower than normal price and will somehow cancel the ticket because the price was a mistake. Can they do that or was I just lucky?