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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56024d8ecba4d8eb1d6aaa6a20c0b5c6953fbcf48f6a9220a5b8a0d9d59db3b8' 
  AND token = 'a5zrgtRJNqTwqPEsbcTXzkbVmy1ngZ89mQ7JFyhC3uI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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