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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68db2712c08659f8e85d6285e9cd5aeccfa4705d7399c399c85ff740e740af86' 
  AND token = 'zM3SapwpHaqv7qr96K4mtmY0jOEUaX/9Z9kS4w2yjIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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