SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '214db4c2d05a057baf2367dface18429743c8a3d95460b7e3157ee512727683a' 
  AND token = 'wK+cfxJeXsRr/wITDGQZ4gFDm9+fZqAVUoH6UbdQxEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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