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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c164a5d14e772f75c464d549d7b2804a77e9cd73f4bf0c27f77e0dcc7a48afe1' 
  AND token = 'zPdSPVd2IpQE3FtzVw7wAwyHSFubeSfC4PbX87/IgfE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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