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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6dfe27dafd65d9cdc0ee2641a8545f32d3ebd95f6807602d6a9d63e8c49fe7a2' 
  AND token = 'haD0g53z4F3qJQdYKUMbtk5d0T5uK0AbkKHfA9inuVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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