SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af202b577563a2d4aef02265733bfb00b8fe0dc62f0724ae74936975d71a6c24' 
  AND token = 'ffMobKGJdr+JUEkpzFVRUF95P2Iy3XpD0eKPHr1cDJY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

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