SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2059eb83317a0d8ab967bc1b1d248669f54bcc2cd61ab665682704add7415cb' 
  AND token = 'hnlgJtcdPmXBWRIGbOMQwZCkrb8O/3bDuvJ0q1ZaHOY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00418

JSON explain

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