SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5028a70e305484476657fbe81fad62e59a4e316471733ef0e08ae63f9f8b28d8' 
  AND token = '1QyNYQ40FO0ouaEQKgZlkUFY/lUSZBo/0fvKWaCFzwM=' 
  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