SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57bcb879cab4229316781a2cb2bf7e6ab5532b3ae410b9534b6903a44f9bd6f2' 
  AND token = 'vjLgdq4IFXM2ap3soTcfowquh/pUGTOlgVcvtXpIryA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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