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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ea5d13295c8b089c5e1682597379bd1aef2fc94c1cf14491c2b9b252781ef50' 
  AND token = 'J4zZHXcyrE+UAgJCKtGbTt/5sIaeTnJG662NBA4sm+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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