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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26a6d319e3bb024850dc50a5f4f215ad3fbcc2b9b629cd523eb9d1482be3c44e' 
  AND token = 'pxSgsu8KNmkLZc66FtCK11OhONtBkgTl1MGWpBTi7vM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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