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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b16c485f98564994df5bafd55d366ba04708e5c83b536afe439ef52f36dda0a' 
  AND token = '0KajXLQpW/+XbuHlKpm769Ff11TfLaX3iv/9PnV8/Lk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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