I would fire your attorney. The question isn't just asking if you were arrested. It is asking if you also had any convictions. You must answer yes. You were convicted of a crime. Speeding is a crime. It's typically a class C misdemeanor, which is a crime. And because you paid the ticket and didn't fight it, that results in a conviction. During the interview, you can discuss. But, in the DS-260, select yes, describe the charge such as "Speeding 55 in 45, Class C Misdemeanor, Charged on: Date, Convicted/Plead Guilty No Contest: Date".