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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '173a4c755bd34267955e33c012acf5677085d42fa857cfe8b37983384c249a91' 
  AND token = 'bXIkb2oHcL+H7QS95Xww316Wt/ZAWn4Pj5DhL6K8C9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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