Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69b529fe7e95367e2f5b299111488e251d60d54509d62c9de2c8261f12ace149' 
  AND token = 'NrS0ISiw6CMNkCi3OdhLF5UkjanrxUKoGCAjrv2adMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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