SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fcb7646887e87580e7b708114e1fcf73037c152d5b20a5bd7327ec8affa6802' 
  AND token = '0iZnrJSqMFFLP/SF3ZTXvIlKOXl50y8EavSIlZQ2sS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

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