SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c5761881ec5fe9797e6864bcf079d4ffd7406b03e3da8fd89d128c2f0b28280' 
  AND token = 'zzBD02j+wXuJsLlkFKQCKALcn6ogk9Ctxoi2TVvJ37k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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