SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfb8f01c3f78aec164e8ecfa31373c3ab0496330538037f602f238b8aa816e7c' 
  AND token = 'f7vQhHtx6woUTmN00yuqN+lHhFOjDthQM9oT/F8Mn3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

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