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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '473ec0f7f9f751fe1cc05ac6995944551d9b63d611b30d51136c77ee676e0c97' 
  AND token = 'HE8YwYO1eNjEHbntbbLVx0ulhbD6v84GaVEKOv1wPxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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