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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fde1f09af01cb00ae1587a225d56626c8c2732568a08e3ae832a5ff996c2c888' 
  AND token = 'F/h06j3BQmiD30TDSaXQn4DzgnvGmZB6xkNCC5Mk1xg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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