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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35f0475a8302cfaf1eab2d303da46a65592638220c80d17c569dc194e4f07dc4' 
  AND token = 'v0k+UiQ0QsDyHrKrlSxe5GSvYFrBzF739PeQhYaBy1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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