SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0aa9b062bd3117fbfd640c2e8601472966c04a8375282859ad7e70b59c7c56b0' 
  AND token = 'vMesRRMAo4IhkgNxxSulL/F/E6+/UVKCKibVvaqD+Tw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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