SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48454c787e1ac47774383fd21f6ac6903d03565ffba12c20339660150beb2120' 
  AND token = '4UHmCWY3cOElG93HQ2jKWeZV5qP+zpA+iSAvJQ7nxnE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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