SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2356484b89110a7787a83e2de258724219a3f231119013055930abfe444733d' 
  AND token = 'rl/2UtsOVz59ebUogjBCwBlcdjnnA9acg8JKvngL1YA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

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