SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e69b253c86e7d5326e41b7228b827056574f812cce3a4c58496bf3dff9d31b20' 
  AND token = 'Voxz5ARJRnn0ZlDJCrrqOnMdfKg5NbazYcraHpq/FbY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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