SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7eeb8b8e319bf44484a51dd2cf56ae48c374a5cd9f1f216a154a91a1c56832e' 
  AND token = 'QYIjiMPUqtPRo0QQ529XU/n+43Ci5tnsRBPxsem4LPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

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