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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d0ee9b69d1879fbb6863e70aa36c29fe91dfa1d7208653aa9c63796b923f688' 
  AND token = 'JP3wEVPINQJnbdfU4mcOkcVBFbWIDv5+Up+FFAEXxxE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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