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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5dd94c5eab3771474b3efd5a84f8af68f5265c79957b99f613b23732b362bc58' 
  AND token = 'nFI0QEYdoiYUeHUmOKxsDBbiK4VNWrW1e5xd8jbtIDY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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