Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '793ef5ec086c36792087f0282aa48c4defa948da33fb030b82d6ee5a0ef4adce' 
  AND token = 'eAOswluU+1pPmRNR3VyNIcjgDG1hDTE1+464zyEn4Xw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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