SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f693cd73704f5011d00bfa17bd0fbe4ed4fbe56e664712d6cb63edccf0911bdb' 
  AND token = 'OP+xN1mUXer4ishFw3b4LCQPF/jhvAjJvq23LoEguTE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

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