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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aae6a25e483f4f8c185c8ed2c924d1686594afd2c79a6fd372cd291421c8c8ab' 
  AND token = 'Ie0k6OcnnxuGMsVqWiGWRVcjNNnjrTnAOyK9h4y2zBk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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