SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '522991bde5d773865766275f9f0a2f0c4c710aa389a6057c47f7c0c2ccd58bbe' 
  AND token = '9xBGV2/OFWaVztmEWQqNIBg+pBKvSOC62YEe+K+9qrA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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