SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd3997f7ffe992094e4a14a958876c1529c1a7fb751ec79a58ec52ca6bf89fc7' 
  AND token = 'hWJpgNVeODj6/Dy6xN/cM5sZojpOi+yW1AQDkU0zHMM=' 
  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