Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba62e21fe6de45ac9ad414bc39c92c1695bcb021953ce4158e03df333b6818fa' 
  AND token = 'QUf51yGzbB/2OpXYl9x7ZGaVpS6xWNaBqbGJ3Y7AnAM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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