SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a323a04107a15bf463e00913809c5c0614437b8e00bb83ac5099952aa9b1787d' 
  AND token = 'SZYkTxF3akdLbgPJFSCUTInOjvWJ4Fv4gOVDJ1F/YRI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

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