SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d352eb7f9e61e3c19bb7a81471460e6d603fa3dd5b40e2fe0011e654eae9da9' 
  AND token = 'Wj6aaWxG24JX8DUGi+M2GEE40jzEP1e3QYXZ4Wa09eA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

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