SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '114b4bbfed2496140c6d456f17f9bca8cec6ca8a088f109c278af6108af08b1c' 
  AND token = 'mjo9orbe+narzhWAzFjNJpF/OkaTUkflqrKbzxNwNyg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

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