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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebd5a3d2726d682c8d2ae76380fbb0d4ac6a77186abdffe1b59f313f3a67af0f' 
  AND token = 'URH9p9QsGb8YP7c6LrW0a6A3iby8lJX+7vrlZH1rNAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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