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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91a7cae5bbee58cffca2c65b923c21cd9ecba3aa17c0970dbc12a03ff74a069f' 
  AND token = 'SpqE5yvK0ec5zDRptC8EzK3wJ4bRjnoulT696RUqx3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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