SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e736ec3f2a92d9d7630d933a4a31f69165bb0b341354fde274fbb1c9f97ed9f3' 
  AND token = 'ViLZd2q72l/AFqhgbCjY+qWdG7KnIPwvFz4WpRh3D5A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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