SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '827ea1a3ece31b8452c371b9a16f74c8a9520c6b458bda88794146f0b5ae2e33' 
  AND token = 'QLy89gvV9VLVC1avatPppRtRigJm+XTZiBJwBbnKKDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

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