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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c41d237a50e6fb09f2ccf6eb4fd3d17f2b02d0cb313906e4e4d9dd27e94dc72c' 
  AND token = 'xzgpreuHVePYYqKHtCoPMKuA9XeczDdhiNagQ285mOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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