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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8dbcd6dfd70e9c5f6dc4d2ea8ca8cb1720d9aee62638ee49a4dbfbd6fc7012b3' 
  AND token = 'wQduRj54OiIrmPYcmRkknWZj3w02cUGBDaCvvQm8oYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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