SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfc34ff1467e32f100236022c42d9ba7c84027465d86272015ddac50ff2640cb' 
  AND token = 'jwlRkj1bfc3LcPMu+Qvs9Z9+uFFQFwIAg6+NXvqCJ9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

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