SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '035976e11189ecab550438a6b7537ce42225dc8eaff300fb70daaf83177ea3ea' 
  AND token = '6afmhl60lbS+uc6yZL7wEYU7yH5yhR3inAiKO67qVxQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

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