SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bee300c2d24180806d3d59f8c5448332461ef86f714b06d22372e76ea480539' 
  AND token = 'iFq/HkCO9tvlOPUtUtn5jquUklykGLkm3rYVfI1/CaQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

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