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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69722cdfa2d9c5e9045c7f6353586c0d7869ac653aa6ea4cfcb61cc5fdb29663' 
  AND token = 'flP32CXWG/CAdzHWTxgpCDnAjF2t2JjwBoyEEFGOa/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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