SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbf74cc8edf8ea64e868e8575f0f0e2602a0ee1f462e0a368ba0c3b0e835611b' 
  AND token = '1QwoUGezXOrAvp/bTYAPLBGW5o8U4GSg7gN+1PDGQOo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

Explain
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE Impossible WHERE noticed after reading const tables