SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60f249ab32c8c5466fb6aaf64c272536fc38698e26599b36618f83decaefe337' 
  AND token = 'mMYDjiAKgxqR2p1GULAUn0DpUhNEzSvPQ7hVPmZ1ztI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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