SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6648ea5c233a6d5b697247447091cb685d69bb9f69c9af5f185b66c29ac8f96f' 
  AND token = 'f2GljjzrpLXMd+xDOnL/ck9Lvvu+c+0xPhMQuHuY2pY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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