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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1dea3dffc4ea285565076d9f48f4acafc593af4320566d8d2f9bb8427a41f07' 
  AND token = 'VW00XnRfdMGHGP2Mr/oZVKcz1nPs9ZzS6V6XQ4YGTTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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