SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77af94266d9253c871ff6b43d7138b208923599c3f284781ad9b69dd24df4caf' 
  AND token = 'WdeDVRw4RvHjmjOcgSsPKXxuLa0lhiQhRyAAN/zY/E8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00073

JSON explain

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