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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75af43604f3ec3ca392b864f53de522416c15d43e840c75666a7dd4cbf492a52' 
  AND token = 'duJsi02Rc9I780JANb6XNhK0ZwjzjouBby+boT5LVm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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