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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb1d7db7ab7c99f336b8aea7c464c248c211ef73e9150e6960ea2cb20bbf0d03' 
  AND token = 'C1fUtOiK+jrKPYbwC7jJPnw7eT5inJBqWIuen3+qkNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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