SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a8a9e64465bbac000436332857fa5889b51929d850eb44ed16d5e4bbd6a98b2' 
  AND token = 'A+tkZjL8LtKUiPX6YuVRPraHniA83LUXuL2pKGFrV3s=' 
  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