Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '816e9096aa3edd00023df61e6438e9b53c60849922be45743e923826745748ec' 
  AND token = 'hIUPfTAAZJUhM0DnjD8Ir+Oqq3IqwavOgHMcdTFfD78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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