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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28b5d3518f6cb8882327d671c3c6fc51aee2e4ff408ebad6506afc5705f8ecdb' 
  AND token = 'kFRHcTXdGWlC76NTLJ33QIDDrHecFDgRc7Fy+jrr9MY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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