SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11828385d8d36d749c3d5f37f02ece9a62292059c160a4a5a5e425b3f48f9a1c' 
  AND token = '0CCj+vDko9yuV5zZTzGqHb55vT+0XP2Yqp6u2K1HjyY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}