I got another problem by finding the correct element for a radio button.
We got two buttons, one for Visa and one for MasterCard. They are build identically, except for the value.

I tried:
wait.until(EC.element_to_be_clickable((By.XPATH, "//input[@type= 'radio'][@value='V']"))).click()
or different combinations from these attributes. There isn't a frame or something like that. Acutally, I should be inside the scope.