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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47917b4a8dd2a15e0dc17194add920d11a835936814f0ee9d09ae5b477e6a087' 
  AND token = 'v7DO7RhtlC1Gn25xiQw7uIi3cL4iI/+7t7PNRke232o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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