SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19e166ec63d4c20084a25371277297a4c5f3ef4b16e8385b42270c582560b112' 
  AND token = 'qjk5UIeGB+Trn935aqgJJzuKfZ/JXQS/e5EqLX1zwZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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