SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c263e480b798b499ad97028b51ce5f7da29a1a3c8895535f1ec92f3b80c6759e' 
  AND token = 'scGfQCh4/wjFY+yox/cEMOzc7EgMPnU4Aa5brZ5qvxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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