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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd56e7fd259298eb1b36a34b3d374306000076b89490a29689a5e0750e86ada09' 
  AND token = 'EoMblIaozMfWEJy1L487Gmx8klWoi3Z5U2+MrDlAuTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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