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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d28fc570aff477a56a08c34967ad7c5f8e76b828f16ffc90bcdfd1c57dc7b9f' 
  AND token = 'YppVMny7ViKY3qiDpE7L0HYlQaimDx1Hj7GafTR9iT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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