SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db532b9057e34ebe7d80621fbf6600f27cd48a20382e9fc752f14d4012e45e9d' 
  AND token = 'HEAq2o/D4TLdpcEkiCy2ECEUc5JWgNB7mu46bUKwdjQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

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