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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcf9a2b9bccd1f069b4ecc1fd9be032998b81a316c92e6109b982ccf0dff1a06' 
  AND token = '4dZVBA2BjcmfTbP7zIqfeRouk8NZU/01N8qz523mIaQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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