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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1861325ad58ec62e7cfb335b9f72e4ad0e391ef09c62e99205d16c1ee70ef22' 
  AND token = 'QhN7NYKKdEtlOeT9sHOW70D1l0LhxNOf04QlxbHPvDc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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